Greenhouse



FIG. 1 is a front perspective view of a greenhouse embodying my new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a plan view thereof;

FIG. 7 is a rear elevational view thereof;

FIG. 8 is an enlarged sectional view taken along lines 8--8 of FIG. 3; and

FIG. 9 is an enlarged sectional view taken along line 9--9 of FIG. 3. 

The ornamental design for a greenhouse, substantially as shown and described. 